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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
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Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
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pH

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The potential of hydrogen (pH) is a measure of the acidity or basicity of a water-based solution determined by the concentration of hydronium ions (H3O+). In one liter of pure water at neutral pH, there are 1×10−7 moles of hydronium ions. However, the extensive range of hydronium ion concentrations present in water-based solutions makes measuring pH in moles cumbersome. Therefore, a pH scale was developed to convert moles of hydronium ions into the negative logarithm of the hydronium...
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The kidneys are two large bean-shaped organs located in the upper abdomen. They filter the blood several times a day to remove toxins and rebalance water and electrolytes of the circulatory system via the renal veins. The kidneys receive blood directly from the heart via the renal arteries. These arteries enter the kidney at the hilum, the concave surface of the bean, where they branch and divide into smaller vessels and capillaries.
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Caffeine Extraction, Enzymatic Activity and Gene Expression of Caffeine Synthase from Plant Cell Suspensions
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Caffeine Extraction from Raw and Roasted Coffee Beans.

Donyau Chiang1, Chih-Yang Lin2, Chen-Ti Hu2

  • 1Instrument Technology Research Center, Natl. Applied Research Laboratories, Hsinchu, 30076, Taiwan.

Journal of Food Science
|March 27, 2018
PubMed
Summary
This summary is machine-generated.

This study models caffeine extraction from coffee beans, finding that roasted beans extract faster and temperature significantly impacts diffusion rates. This research aids the decaffeinated coffee industry.

Keywords:
coffeeextractionmodeling

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Area of Science:

  • Food Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Caffeine, a stimulant in coffee, influences human physiology and behavior.
  • Understanding caffeine extraction is crucial for product refinement and consumer health.
  • Variations in raw and roasted coffee beans necessitate specific extraction studies.

Purpose of the Study:

  • To investigate caffeine extraction from raw and roasted coffee beans of three types at varying temperatures.
  • To develop and validate a hemispheric model for simulating caffeine extraction.
  • To analyze the impact of temperature on caffeine diffusion and incubation periods.

Main Methods:

  • Developing a hemispheric model to simulate caffeine extraction.
  • Conducting experiments on three coffee bean types (raw and roasted) at different temperatures.
  • Measuring surface energies using contact angle measurements.

Main Results:

  • Experimental data validated the hemispheric model.
  • Effective caffeine diffusivity increased with temperature for all bean types.
  • Roasted beans showed significantly faster caffeine extraction than raw beans, especially at lower temperatures.
  • An inverse relationship was observed between incubation period and temperature.

Conclusions:

  • Caffeine diffusion and incubation are thermally activated processes.
  • Surface energy differences between raw and roasted beans influence incubation periods.
  • Findings have practical applications for the decaffeinated coffee industry and product development.